Volcanic Rune is a Guild skill, found in the Mages Guild Skill line.
Base Skill: Fire Rune
|Inscribe a rune of cosmic fire on the earth, which takes 2 seconds to arm and lasts for 20 seconds. When triggered, the rune blasts all enemies in the target area for 2323 Flame Damage, knocks them into the air, and stuns them for 3 seconds.|
Volcanic Rune is a morph of the Fire Rune base skill. The other morph is Scalding Rune.